Unlimited Madden Cash:
Go to 'Season' and select the 'Cheats' option, if you then type 'Madden#1' (without the quotes) you will get unlimited Madden cash.

How to unlock Emmett Smith:
First you open the app and you wait for it to load and once it loads there should be a special pack pop up on the screen and it says old pack and if you have a lot of money purchased it